pub use kittybox_util::micropub::{Config, Error as MicropubError, QueryType};
use soup::prelude::*;

#[derive(Debug)]
pub struct Client {
    pub me: String,
    micropub: String,
    pub access_token: String,

    http: soup::Session,
}

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("glib error: {0}")]
    Glib(#[from] glib::Error),
    #[error("json serialization error: {0}")]
    Json(#[from] serde_json::Error),
    #[error("micropub error: {0}")]
    Micropub(#[from] MicropubError),
    #[error("micropub server did not return a location: header")]
    NoLocationHeader,
}

impl Client {
    pub fn new(http: soup::Session, uri: glib::Uri, token: String, me: String) -> Self {
        Self {
            micropub: uri.to_string(),
            access_token: token,
            me,
            http,
        }
    }

    pub async fn config(&self) -> Result<Config, Error> {
        let uri = glib::Uri::parse(&self.micropub, glib::UriFlags::NONE).unwrap();
        let uri = super::util::append_query(&uri, [("q".to_string(), "config".to_string())]);

        let exch = soup::Message::from_uri("GET", &uri);
        let headers = exch.request_headers().expect("SoupMessage with no headers");
        // TODO: create a SoupAuth subclass that allows pasting in a token
        headers.append("Authorization", &format!("Bearer {}", self.access_token));

        let body = self
            .http
            .send_and_read_future(&exch, glib::Priority::DEFAULT)
            .await?;
        if exch.status() == soup::Status::Unauthorized {
            return Err(
                MicropubError::from(kittybox_util::micropub::ErrorKind::NotAuthorized).into(),
            );
        }

        Ok(serde_json::from_slice(&body)?)
    }

    pub async fn send_post(&self, post: microformats::types::Item) -> Result<glib::Uri, Error> {
        let uri = glib::Uri::parse(&self.micropub, glib::UriFlags::NONE).unwrap();
        let exch = soup::Message::from_uri("POST", &uri);
        let headers = exch.request_headers().expect("SoupMessage with no headers");
        headers.append("Authorization", &format!("Bearer {}", self.access_token));

        exch.set_request_body_from_bytes(
            Some("application/json"),
            Some(&glib::Bytes::from_owned(serde_json::to_vec(&post).unwrap())),
        );

        let body = self
            .http
            .send_and_read_future(&exch, glib::Priority::DEFAULT)
            .await?;

        match exch.status() {
            soup::Status::Created | soup::Status::Accepted => {
                let response_headers = exch
                    .response_headers()
                    .expect("Successful SoupMessage with no response headers");
                let location = response_headers
                    .one("Location")
                    .ok_or(Error::NoLocationHeader)?;

                Ok(glib::Uri::parse(&location, glib::UriFlags::NONE)?)
            }
            soup::Status::InternalServerError
            | soup::Status::BadGateway
            | soup::Status::ServiceUnavailable => {
                todo!("micropub server is down")
            }
            soup::Status::Unauthorized => {
                Err(MicropubError::from(kittybox_util::micropub::ErrorKind::NotAuthorized).into())
            }
            _ => {
                let error = match serde_json::from_slice::<MicropubError>(&body) {
                    Ok(error) => error,
                    Err(err) => {
                        tracing::debug!(
                            "Error serializing body: {}",
                            String::from_utf8_lossy(&body)
                        );
                        Err(err)?
                    }
                };

                Err(error.into())
            }
        }
    }
}